Automatic Volume Control


I have a 2012 Gen Sedan, my radio volume always adjust itself when I'm driving. If I have the volume high, when coming to a stop it gets low. Also If I have the volume high, once I start driving it adjust itself louder. Is there anyway options on turning that off so I can have complete control of my volume system?
My Gen do not come with the DVD player or Navigation system. It has the small LED display radio screen, not the double din one.
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